﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Bai06
{
    class CRectangle
    {
	    int width, height;
         public CRectangle(){
             width=5;
             height=5;
         }
         public CRectangle(int a, int b)
         {
             width = a;
             height = b;
         }
         public int area()
         {
             return width * height;
         }
}
    class Program
    {
        static void Main(string[] args)
        {
            CRectangle recta=new  CRectangle (3, 4);
	        CRectangle rectb=new CRectangle();
            Console.WriteLine("recta:{0}", recta.area());
            Console.WriteLine("rectb:{0}", rectb.area());
        }
    }
}
